Description
Wazuh agent from 1.0.0 before 4.14.9 contains a stack-based buffer overflow in the logcollector snort-full log reader that miscalculates remaining buffer space in read_snortfull(). Attackers who write crafted multi-line content to a monitored snort-full log can overflow the 65,280-byte stack buffer, crashing the agent or overwriting an SEH handler on 32-bit Windows agents running as SYSTEM.
Published: 2026-11-06
Score: 6.8 Medium
EPSS: n/a
KEV: No
Impact: Stack Buffer Overflow
Action: Upgrade
AI Analysis

Impact

The vulnerability resides in the Snort full log reader of the agent, where the function miscalculates the remaining buffer space as it processes a synthetic multi‑line input. This miscalculation can overflow a 65,280‑byte stack buffer. For an attacker controlling the log content, the overflow could crash the agent or corrupt an SEH handler on 32‑bit Windows platforms that run the agent as SYSTEM, potentially allowing local privilege escalation or arbitrary code execution if the SEH overwrite leads to execution of attacker supplied code. The flaw is type CWE-121, a stack buffer overflow, and its impact affects confidentiality, integrity, and availability of the infected system.

Affected Systems

Vendors identified by the numbering authority include Wazuh, with the product named Wazuh. The issue affects agent versions from the first release in 1.0.0 up through 4.14.8. Upgrade to version 4.14.9 or later resolves the bug; earlier versions remain vulnerable.

Risk and Exploitability

The CVSS score of 6.8 indicates a medium severity. Because no EPSS data is available, the current exploitation probability cannot be quantified, and the vulnerability is not listed in the CISA KEV catalog. The attack vector requires an attacker to write crafted content into a monitored snort‑full log file; therefore the threat is limited to environments where the agent has write access to such logs and the system uses the 32‑bit Windows build running as SYSTEM. The likelihood of a successful exploit in the wild remains uncertain but could be feasible in constrained, high‑value targets.

Generated by OpenCVE AI on November 6, 2026 at 16:51 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest agent release, 4.14.9 or newer, which resolves the buffer overflow flaw in the snort‑full log reader.
  • Disable or restrict write access to snort‑full log files to prevent attackers from injecting crafted log data.
  • Implement OS‑level hardening by running the agent with the least privilege required, monitoring log file integrity, and applying security patches to the underlying OS.

Generated by OpenCVE AI on November 6, 2026 at 16:51 UTC.

Tracking

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Advisories

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History

Fri, 06 Nov 2026 15:15:00 +0000

Type Values Removed Values Added
Description Wazuh agent from 1.0.0 before 4.14.9 contains a stack-based buffer overflow in the logcollector snort-full log reader that miscalculates remaining buffer space in read_snortfull(). Attackers who write crafted multi-line content to a monitored snort-full log can overflow the 65,280-byte stack buffer, crashing the agent or overwriting an SEH handler on 32-bit Windows agents running as SYSTEM.
Title Wazuh Agent 1.0.0 before 4.14.9 Stack Buffer Overflow via read_snortfull
First Time appeared Wazuh
Wazuh wazuh
Weaknesses CWE-121
CPEs cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*
Vendors & Products Wazuh
Wazuh wazuh
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 6.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-06T15:00:43.252Z

Reserved: 2026-10-19T14:41:46.701Z

Link: CVE-2026-112335

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-06T15:17:07.730

Modified: 2026-11-06T15:17:07.730

Link: CVE-2026-112335

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-06T17:00:10Z

Weaknesses
  • CWE-121

    Stack-based Buffer Overflow